Added an args argument array to the cmb_Meta_Box constructor to specify (via the allow_frontend key) whether or not fields should be allowed to display in the frontend. If set to true, fields can be output with the cmb_print_metaboxes() and cmb_print_metabox() functions. The default value is false, but can be overriden using the cmb_allow_frontend filter.
Added setting to allow setting data for frontend fields.
Merge branch 'pr/345' into trunk

# By Simon Fransson
# Via Simon Fransson
* pr/345:
  Added setting to allow setting data for frontend fields.
  Added an args argument array to the cmb_Meta_Box constructor to specify (via the allow_frontend key) whether or not fields should be allowed to display in the frontend. If set to true, fields can be output with the cmb_print_metaboxes() and cmb_print_metabox() functions. The default value is false, but can be overriden using the cmb_allow_frontend filter.